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Atomic oscillator and method for fabricating atomic oscillator

a technology of atomic oscillators and masers, which is applied in the direction of oscillator generators, pulse automatic control, masers, etc., can solve the problems of short-term stability degraded frequency

Active Publication Date: 2013-01-17
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention solves or reduces one or more of the problems described in the patent text.

Problems solved by technology

Thus, there is a problem in which short-term stability of the frequency is degraded.

Method used

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  • Atomic oscillator and method for fabricating atomic oscillator
  • Atomic oscillator and method for fabricating atomic oscillator
  • Atomic oscillator and method for fabricating atomic oscillator

Examples

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first embodiment

[0043]Anatomic oscillator and a method for fabricating the atomic oscillator in a first embodiment will be described. As illustrated in FIG. 2, the atomic oscillator in the first embodiment is regarded as a miniaturized atomic oscillator of a Coherent Population Trapping (CPT) method and includes a light source 10, a collimator lens 20, a λ / 4 plate 30, an Alkaline metal cell 40, a light detector 50, and a modulator 60.

[0044]For the light source 10, a laser element of a surface emitting laser element or the like may be used. Cs (Caesium) atom gas is enclosed by the Alkaline metal cell 40 as the Alkaline metal. A photodiode may be used for the light detector 50.

[0045]In the atomic oscillator in the first embodiment, light emitted from the light source 10 is irradiated to the Alkaline metal cell 40 through the collimator lens 20 and the λ / 4 plate 30, and electrons in the Alkaline metal atom are excited. The light passing through the Alkaline metal cell 40 is detected by the light detec...

second embodiment

[0063]Next, a second embodiment will be described. In the second embodiment, an atomic oscillator including an Alkaline metal cell different from the first embodiment and a method for fabricating the same will be described with reference to FIG. 4A through FIG. 4H. In FIG. 4A through FIG. 4H, elements that are the same as those illustrated in the previously described figures are indicated by the same reference numerals and the explanation thereof will be omitted.

[0064]First, as illustrated in FIG. 4A, the Si substrate 110 is prepared. The Si substrate 110 is 1 mm in thickness and both sides thereof are mirror-finished. In the second embodiment, as described later, by bonding two Si substrates 110, the Alkaline metal cells are formed. Thus, two Si substrates 110 are prepared.

[0065]Next, as illustrated in FIG. 4B, a metal film 210 is formed in a predetermined area of one surface of one Si substrate 110. The metal film 210 is formed in areas other than areas where the opening parts 111...

third embodiment

[0080]Next, the third embodiment will be described. In the third embodiment, an atomic oscillator including Alkaline metal cells different from those in the first and second embodiments and a method for fabricating the same will be described with reference to FIG. 6A through FIG. 6H. In FIG. 6A through FIG. 6H, elements that are the same as those illustrated in the previously described figures are indicated by the same reference numerals and the explanation thereof will be omitted.

[0081]First, as illustrated in FIG. 6A, the Si substrate 110 is prepared. The Si substrate 110 is 1 mm in thickness, and both sides thereof are mirror-finished. In the third embodiment, as described later, since three Si substrates are bonded to form the Alkaline metal cell, three Si substrates 110 are prepared.

[0082]Next, as illustrated in FIG. 6B, the opening parts 111 are formed to each of three Si substrates 110. Specifically, the photo-resist is coated on one surface of each of the Si substrates 110. ...

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Abstract

An atomic oscillator is disclosed, including an Alkaline metal cell, a light source illuminating a laser beam to the Alkaline metal cell, and a light detector detecting light passing through the Alkaline metal cell. The Alkaline metal cell includes a first member, a second member, a cell internal portion, and an Alkaline metal raw material. In the first member, a first glass substrate is bonded on a second surface of a first substrate where a first opening part is formed. In the second member, a second glass substrate is bonded to a fourth surface of a second substrate where a second opening part is formed. The cell internal portion is formed by the first opening part and the second opening part by bonding the first surface to the third surface. The Alkaline metal raw material is enclosed by the cell internal portion.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is related to an atomic oscillator and a method for fabricating the atomic oscillator.[0003]2. Description of the Related Art[0004]An atomic clock (atomic oscillator) is regarded as a timekeeper with significant clock precision. Technologies for minimizing the atomic clock have been researched. The atomic clock is formed as an oscillator which refers to a transient energy amount of electrons forming an atom such as Alkaline metal or the like. Especially, a significantly precise value is acquired based on a transient energy of the electrons of the atom of the Alkaline metal in a state in which there is no disturbance.[0005]Compared with a crystal oscillator, it is possible to acquire frequency stability having significant higher figures.[0006]There are some methods for the atomic clock. Among others, an atomic clock of a Coherent Population Trapping (CPT) method has frequency stability of approximat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03B17/00H05K13/00
CPCG04F5/14Y10T29/49002H03L7/26
Inventor SATO, SHUNICHIITOH, AKIHIROSATO, YUKITO
Owner RICOH KK
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